18438128712 has 64 divisors (see below), whose sum is σ = 51585576000. Its totient is φ = 6101816832.

The previous prime is 18438128693. The next prime is 18438128741. The reversal of 18438128712 is 21782183481.

18438128712 is a `hidden beast` number, since 184 + 381 + 2 + 87 + 12 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 277033 + ... + 337080.

It is an arithmetic number, because the mean of its divisors is an integer number (806024625).

Almost surely, 2^18438128712 is an apocalyptic number.

18438128712 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18438128712 is an abundant number, since it is smaller than the sum of its proper divisors (33147447288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18438128712 is a wasteful number, since it uses less digits than its factorization.

18438128712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614267 (or 614257 counting only the distinct ones).

The product of its digits is 172032, while the sum is 45.

The spelling of 18438128712 in words is "eighteen billion, four hundred thirty-eight million, one hundred twenty-eight thousand, seven hundred twelve".